Spark plug



April 17, 1934 M. T. GAILLAR D ETAL 1,955,628

SPARK PLUG Filed July 9, 1932 Patented Apr. 17, 1934 PATENT OFFICE SPARKPLUG Milton T. Gaillard, Halesite, and William J. Woodcock, Brooklyn, N.Y.

Application July 9. 1932, Serial No. 621,678

8 Claim.

This invention relates to an attachment for a spark-plug, such as willprovide a proper heating chamber for the gaseousfuel and cause anatomizing of the gas at the nose of the sparkplug where the ignitiontakes place. The ignition does not take place at the lower end of thepreheating chamber, but in the upper compartment where the attachment isapplied to the lower end of the spark-plug, thereby eliminating foulingof the spark-plug above, preventing carbon formation, and producing aflame in the cylinder instead of merely an electric-spark.

This invention embodies a shell attached to the lower end of thespark-plug and enclosing a sleeve spaced from the wall of the shell soas to provide a passageway therebetween for the gaseous mixture to passup through the shell and be discharged through the orifice at the upperend of the sleeve, in an atomizing action, directly 2() at the point ofspark or ignition which takes place .therefor at the upper end of theinternal chamber and communicates with the cylinder down through thechamber, producing a burning flame in the cylinder which completelyconsumes approximately all of the gas.

In the accompanying drawing:

Fig. 1 is a sectional view through our attachment applied toa'sp'ark-plug, in which the latter is shown partly in side elevation;

Fig. 2 is a top plan view of the attachment; an

of, the unit in perspective.

The spark-plug is designated as a whole by the numeral 1, and may be ofa conventional type to which this invention is applied. The usualelectrodes are shown at 2, while the threaded lower end of thespark-plug is designated 3, and this normally screws into the casing ofthe engine so as to dispose the electrodes in communication with thecylinder.

Our attachment embodies a shell 4, the upper end of which is internallyscrew-threaded, as at 5, to screw onto the threaded portion 3 of thespark-plug, while the lower end portion is extemally threaded as at 6 tobe screwed into the spark-plug opening in the engine casing.

A nut portion 7 is formed on, or secured to, the shell 4 to facilitatetightening of it on the lower end of the spark-plug and screwing of theunit into the engine casing.

A sleeve 8' of substantially smaller diameter than the internal diameterof the shell is mounted in the shell, leaving an annular gas passage -9therebetween. The upper end of the sleeve 8 has Fig. 3 is'a disassembledview showing the parts lateral flanges 10 with slits or notches 11ther'e' between, which flanges are formed by slitting the upper end ofthe cylindrical sleeve and bending the slit portions laterally to formthe flanges. The flanges seat on a shoulder 12 formed in the shell 4, asshown in Fig. 1, so that they support the sleeve 8 concentrically in theshell. A disk or baille-plate 13v flts on top of the flanges 10, and isof a size to be engaged by the lower end of the spark-plug to clamp theflanges 10 in place on the shoulder 12, and thus securely hold thesleeve 8 in place.

This disk or battle-plate also causes an inward directing of the gaseousfuel through the notches or openings 11 into the interior of the sleevejust beneath the electrodes 2 which communicate with this space throughan opening 14 in the disk or baflle-plate.

' The burning of the fuel in the sleeve 8 creates a suction throughopenings 11 and around the sides of the sleeve, which'draws the fuel upthrough the annular passage 9 where it is preheated before combustion,and this preheated fuel is atomized through the slits or openings 11directly at the end of the spark-plug where combustion takes place. Theignition does not first so take place at the lower end of the chamber,but

at a point at the upperend thereof, thereby eliminating any fouling ofthe spark-plug above and preventing carbon formation. At the same timethis action produces a flame in the cylinder for s5 consuming the gas,and the gas is thereby completely consumed.

We claim: g

1. The combination with a spark-plug having cooperatingspark-electrodes, of a shell attached to the spark-plug and extendingdownwardly from the lower end thereof, a-sleeve mounted in the shell andcooperating therewith to provide a passageway extending upwardly in theshell externally of the sleeve, said sleeve having one or more openingsat theupper end thereof establishing communication between thepassageway and the sparking-electrodes and conveying preheated gaseousfuel thereto.

2. The combination with a spark-plug having cooperatingspark-electrodes, of a shell attached to the lower end of the spark-plugand extending downwardly therefrom, a sleeve mounted in the shell andcooperating therewith to provide a passageway within the shellcommunicating with the upp f end thereof approximately at the point ofthe electrodes.

3. The combination with a spark-plug having spark electrodes, of a-shellremovably attached to the lower end of the spark-plug, a. sleeve mountedin the shell in spaced relation from the walls thereof providing anupwardly-extending passageway therebetween, thev upper end of the sleevebeing flared laterally and supporting the sleeve in the shell, saidsleeve having one or more openings at the upper end only thereof, anddisposed beneath the sparking electrodes for direct ing the gaseous fuelfrom the passageway into communication with the electrodes.

4. The combination with a spark-plug having spark electrodes at thelower end thereof, of a shell detachably secured to the lower end of thespark-plug and having an internal shoulder, a sleeve mounted in theshell in spaced relation from the walls thereof, providing anupwardlyextending passageway therebetween, the sleeve having outwardlyextending flanges at the upper end thereof seated on the shoulder in theshell, and having openings between the flanges, and a disk orbaffle-plate seated on the flanges and clamped between the flanges andthe lower end of the spark-plug to hold the shell in place, said diskhaving an opening therein beneath the sparking-electrodes.

5. The combination with a spark-plug having sparking electrodes at thelower end thereof, of a shell having screw-threaded connection with thelower end of the spark-plug to be detachably secured thereto, said shellhaving an internal annular shoulder therein, a tubular sleeve mounted inthe shell in spaced relation from the internal walls thereof providing apreheating passageway therebetween, said sleeve having an internalchamber in direct vertical alignment with the electrodes and beneath theelectrodes, flanges secured to the sleeve and seated on the shoulder inthe shell, and a disk or bafiie-plate clamped between the lower end ofthe spark-plug and the flanges to hold the shell in place, and having acentral opening between the internal chamber of the sleeve and thesparking-electrodes, said sleeve having one or more openings thereinbeneath the disk or baffle-plate establishing communication between saidinternal chamber and the surrounding passageway.

6. The combination with a spark-plug having sparking-electrodes at thelower end thereof, of a shell extending downwardly from the lower end ofthe spark-plug, a sleeve ,within the shell forming an internal chamberin axial alignment with the spark electrodes and beneath the electrodesand having an upwardly-extending passageway outside of said chambercommunicating with the upper end of the chamber at the point of theelectrodes.

7. An attachment for an end of a spark-plug of the type which hascooperating spark electrodes comprising a shell having means forattaching the same to the end portion of the sparkplug, a sleeveconcentrically within said shell and forming an internal chamberarranged in position to be aligned with the spark electrodes and beneaththe electrodes, and having a longitudinally extending passageway outsideof said chamber communicating with an end thereof at the point of thecooperating spark electrodes.

8. An attachment for an end of a spark-plug of the type which hascooperating spark electrodes, comprising a shell having means ofattachment to the end of the spark-plug, a sleeve mounted in the shellin spaced relation from the walls thereof providing an upwardlyextending passageway therebetween, the end of the sleeve being flaredlaterally and supporting the sleeve in the shell, said sleeve having oneor more openings at said flared end only thereof and disposedapproximately at the point of the spark electrodes for directing thegaseous fuel from the passageway into communication with the electrodes.

MILTON T. GAILLARD.

WILLIAM J. WOODCOCK.

